Brush



May 13, 1941- w. A. CHAPMAN BRUSH Filed April 6, 1938' ATTORNEYS Patented May 13, 1941 inll i ilTE D STATEg FATE??? @FFEQE BRUSH "Willis A. Chapman, Shaker Heights, Ohio, as-

signor of one-half to Wm. A. Spear, Cleveland,

Ohio

'2 Claims.

This invention relates to brushes and is particularly applicable to circular brushes such as are driven by power and made in many sizes for many different types of work.

An object of the invention is to provide an improved brush in which the filaments or bristles will be securely held.

J Another object is to provide an improved brush which will consist of few and simple parts.

Another object is to provide an improved brush which may be easily manufactured.

Another object is to provide an improved brush in which shifting of the filaments circumferentially is precluded.

Another object is to provide an improved brush which may be readily applied to filaments of a variety of materials, such as those made of metallic, vegetable, or animal matter.

Another object is to provide an improved brush which may be used as a section readily assembled into composite brushes.

Other objects will hereinafter appear.

The invention will be better understood from the description of several practical embodiments thereof illustrated in the drawing, in which:

Figure 1 is a perspective view of the component parts of one type of brush embodying the invention;

Figure 2 is a diametric sectional view of the completed brush formed from the parts of Figure Figure 3 is a view similar to Figure 2 showing a brush of a different type also embodying the invention;

Figure 4 is a View similar to Figures 2 and 3 showing a brush constituting another embodiment of the invention; and

Figure 5 is another diametric sectional view, showing a plurality of brushes such as shown in Figures 1 and 2 assembled into a composite widefaced brush and constituting another embodiment of the invention.

The brushes illustrated are all of types in which filaments composed of any desired material such as metallic wire (which may be round, fiat or square), vegetable fibers such as tampico, or animal fiber such as the various known types of bristles, are secured in a rigid hub so that they project in a generally radial direction therefrom.

The hub is shown in Figures 1 and 2 as consisting of a single piece of metal conveniently formed from a piece of tubing which is first flanged, as indicated at l, at one end, and thereafter the internal surface of this flange and the roughened in any desired manner. This roughening may-conveniently be by knurling the surface as indicated at 3, or by forming grooves or corrugations therein.

After so forming the hub, the filaments or bristles t are inserted about a retaining ring 5. The ring consists of a circular piece of material having a plurality of inwardly extending prongs 5 to locate the sam upon the'exterior of the cylindrical portion of a tubular hub.

The filaments are formed into a bent or U- shape, so that the two ends of each filament extend outwardly radially from the ring, while the central bent portion or bight thereof underlies the ring.

With the bristles and filaments and ring assembled as above described, the cylindrical portion of the hub is inserted within the central aperture of the ring, and the remaining end of the cylindrical portion 2 is flanged outwardly as shown in Figure 2 to form a second flange 1 similar to that (I) previously formed on the other end, and to clamp the centrally disposed portion of the filaments and the ring between said flanges.

During the flanging operation, the tubular part 2 of the hub may be slightly expanded, thus forcing the prongs 6 into the material of the hub and firmly locking the disc against rotation relative thereto.

It will be understood that the exterior portion of the ring, like the filament engaging portions of the hub, will be roughened, grooved, or corrugated, so that the filaments are retained between two pairs of roughened surfaces, those of the inner sides of the two hub flanges and the two sides of the ring, and that when the flanges of the hub are pressed tightly upon these filaments, the latter are very effectively held against any circumferential displacement.

The filaments are, of course, held against radial displacement also by this clamping action, and also by the fact that each passes between the ring and the hub.

Figure 3 shows a brush in which the end flanges it! and Nil instead of being .flat discs are frustro-conical in shape, thus producing a cupped type of brush.

In Figure 4 the hubis shown as formed of three parts, namely-two washer-like nd discs 2i}! and 2N and a tubular ferrule 292 which is flanged outwardly at its ends 2m to tightly clamp the discs upon the mass of filaments.

Figure 5 shows a number of brushes similar to those above described assembled upon a single tubular holder 3! for the purpose of producing a multi-section brush for certain types of operations. It is only necessary in the production of such a brush to slide the various sections such as shown in Figures 2 or 4 upon the tube 310 and flange its ends outwardly to clamp the sections tightly together.

Of course it will be apparent that the hub and ring may be very conveniently formed of metal. However, this is not essential, as the ring may be constructed of fiber or other sheet or molded material, and, due to the manner in which it is tightly clamped within the hub, it need not have as great tensile strength as would a metal ring.

The hub itself might be of material other than metal, as for instance, of fiber composition which, when being formed, might be rendered more workable by the application of heat in a manner well understood in the art.

However, for ordinary purposes I find that the skilled in this art, and I do not, therefore, limit myself to the precise details shown and described, but claim as my invention all embodiments, variations, and modifications thereof coming within the scope of the appended claims.

I claim:

1. The method of forming brushes which comprises fianging one end of a piece of tubular material, then roughening the exterior of the tubular portion of said piece and the inward side of said flange, then assembling filaments through a retaining ring having roughened sides, placing the ring and filaments about said tubular portion, and then flanging the other end of the tubular piece to clamp said filaments and ring between the roughened sides of said flanges.

2. The method of forming brushes which com prises flanging one end of a piece of tubular material, then knurling the exterior of the tubular portion of said piece and the inwardly side of said flange, then assembling filaments through a sheet metal retaining ring having centrally directed projections, placing the ring and filaments about said tubular portion, then flanging the other end of the tubular piece to clamp said filaments and ring between the knurled side of said flanges and simultaneously expanding said tubular piece to force the projections of the ring into the material thereof.

W. A. CHAPMAN. 

